EP1232834A2

EP1232834A2 - Diamond machine, provided with an electronic detecting and controlling system to detect and control the shape of a piece to be incised

Info

Publication number: EP1232834A2
Application number: EP02003404A
Authority: EP
Inventors: Gianluigi Dal Lago
Original assignee: Faimond Srl
Current assignee: Faimond Srl
Priority date: 2001-02-19
Filing date: 2002-02-14
Publication date: 2002-08-21
Anticipated expiration: 2022-02-14
Also published as: EP1232834A3; ITVR20010020A0; ITVR20010020A1; DE60201925D1; ATE282505T1; EP1232834B1

Abstract

The present detecting system utilizes a detector of the telecamera type or the like that permits to visualize, in a suitable monitor, both the shape of a chain link and its position on a vice in comparison with incising tools.

The peculiarity of the present invention is the presence of a controlling device that includes a digital telecamera detector (8) arranged in the upper part of a head and preferably on the vertical of the incising point of the tools, and a monitor (9), equipped with instruments for the control, detection and process of sample images as well as the instantaneous control of the link feeding onto the vice.

Description

The present industrial invention proposes a diamond machine or the like. Its inventive peculiarity is the presence of an electronic detecting system for detecting the shape of a piece to be diamond-incised, in particular for detecting the shape of each link or ring or other element of a chain, chainlet or similar jewelry object.
More precisely, the diamond machine according to the present invention is equipped with a detecting and controlling device that permits to perform a machining of high precision, i.e. only in determined sectors or in the wished sectors of each chain link.
As a matter of fact, this device calculates the error between the nominal position and the real position of each single piece, for instance in case of differences among the chain links or in case of different mounting distances.
The present detecting system utilizes a detector of the telecamera type or the like that permits to visualize, in a suitable monitor, the shape of each link and its position on a vice in comparison with the incising tools.
The machine and its detecting system according to the present invention can be included in a specific field, namely, the activity of planning and constructing precision machines for jewelry, in particular machines of high technology, utilized in the diamond-incision field for the diamond-incision of surfaces of chains, chainlets in precious metals or non-precious metals or articles of costume jewelry.
It is known that in the field of diamond machines, several models of diamond machines are produced and marketed for the diamond-incision of chains, chainlets and jewels in general. The most demanded diamond machines are the automatic machines for multiface chain tracery and diamond-incisions to obtain chains showing a rounded or shaped outline, thread chains, pipe chains and bar chains. In addition, there is a great demand for lapping diamond machines to obtain flat or concave or convex or angled surfaces.
By utilizing the above machines it is possible to accomplish an operation schedule in a completely automatic way, both continuous and alternate. These machines are provided with a tool-supporting head, which position can be adjusted to perform a different machining since the axes of the tools can be arranged horizontally or vertically.
In some cases, the working can be visualized through a videocamera and the movement of the so-visualized axes is controlled by a numerical control unit.
The utilization of the aforesaid machines is very diffuse and is unreplaceable in this field. However, there is a problem and a necessity that are still to be solved and that the technicians of this field have not been able to solve up to now since the instruments utilized are inadequate and unprecise. It is the necessity of seeing the actual shape and position of the piece to be processed while the piece is under the tools in order to correct the possible errors of this position in a precise and totally automatic manner, the working speed remaining sufficiently high.
In fact, position errors can occur during the feeding of the single pieces forming the chain while the chain is kept by the vice or other supports.
Till now, the adjustment of the position of the single links forming the chain to be diamond-incised in comparison with the incising diamond tools has been effected by using very unprecise, complex, expensive devices. In addition, these devices move very slowly.
For instance, devices of the jack type have been utilized in which a single chain link is taken at a time.Then, the single chain links are fed progressively and in succession under the tools.
In other cases, detecting jigs or optical fibre devices or similar devices have been utilized to detect the links or rings or pieces forming the chain to be processed but also in these cases the aforesaid drawbacks occured.
The aim of the present invention is to conceive and carry out an incising diamond machine equipped with a vice in which a proper movement of the vice causes an exact positioning of the single chain links since the position of each chain link is detected and corrected, if necessary, in comparison with the barycentre of the tools.
The main object of the invention is to conceive and carry out a detecting system that permits an excellent precision and works very rapidly. In practice, an instrument for controlling the diamond-incision permits to operate with a very rapid feeding speed and with results that have never been reached so far.
All the above mentioned aims and advantages are reached according to the present invention through an incising diamond machine equipped with a detecting electronic system to detect the shape of the pieces to be diamond-incised, characterized by the fact that the said detecting system is based on the presence of at least one detecting apparatus such as a telecamera or the like, positioned near the vertical of the piece to be machined, which piece is fed to a vice or the like; images of the piece are transmitted to a monitor that includes means to set up and process parameters, and by the fact that the set up and processed working parameters are then transformed in signals to move the vice that holds the piece so that the vice is able to instantaneously and micrometrically displace each ring or link or piece to be worked and to exactly adjust the barycentre of the piece under the incising diamond tools of the head.
While positioning each single piece, the correction of the error is done on comparing the position of the light and dark zones (full and empty zones) of each link or ring as well as the position of the same zones detected on a sample image; the sample image represents the working barycentre for the tools.
Further characteristics and details of the present invention will be better understood from the following description, given as a nonlimiting example, on the base of the accompanying drawings, wherein:

Fig. 1 shows a schematic front view of a possible constructive example of an incising diamond machine on which a detecting system according to the present invention operates;
Fig. 2 is a schematic view of a possible monitor detection of the piece machined; and
Fig. 3 is a schematic view of a processing phase of the sample image in which a scale tracing is defined with the consequent correction of the errors.

With reference to the accompanying drawings, number 1 denotes, as a whole, a diamond machine such as the machines that process concatenated chain links of any type and shape.
The present diamond machine includes a head 2 that supports a working unit 3.
The working unit 3 is equipped with diamond-incising tools showing horizontal and vertical axes.
In case, the diamond-incising tools can be provided with a device for changing the tools and a lower vice 4.
A continuous chain 5 is fed between tension rollers 6 and 7 and runs onto the vice.
For the purposes of the present invention it is preferable to utilize a vice 4 equipped with a feeding system actuated by a step by step motor or an electronic control motor. The vice can move forward or backward indifferently in order to exactly adjust the position of the chain links. In addition, it is better that the tension rollers 6 and 7 be provided with a forward and backward recovery device.
The recovery device is the object of an earlier patent filed by the same applicant.
The peculiarity of the invention is the presence of a control device including a digital detecting telecamera 8 placed in the upper part of the head and preferably on the vertical of the cutting point of the tools, and a monitor 9 equipped with instruments for the control, detection and process of sample images and the instantaneous control of the link feeding onto the vice.
The so-obtained system is able to produce monitor images representing shape and dimensions of the links to be worked. These images form the base on which the operative parameters are set up. In practice, these parameters define the displacement of vice and tools with a centesimal or even millesimal precision.
As shown in Figure 3, image 10 is detected and represented in the monitor. This image represents the outline of the links to be processed while they are clamped by the vice under the tools. The image shows light zones "A" and dark zones "B", the former being full link zones and the latter being empty link zones.
The first phase of the detecting system consists in identifying shape and dimensions of the link or standard element through a scale tracing. The so-called scale tracing is effected by displacing the vice in order to bring the link to the centre of the monitor. Then, the operator traces the main co-ordinates of the piece to be machined by utilizing suitable tracking instruments such as a mouse or the like. These co-ordinates are the co-ordinates "X" and "Y" that are calculated in the border line between the light zones "A" and the dark zones "B" of the chain link.
At this stage, an image is processed by utilizing software so that the system knows the sample image. This image usually has a barycentre and borders where the tools work to decorate the piece. The sample image can determine with precision the position the clamped link must take up under the tools.
When owing to the rotary movement of the vice the link or piece arrives under the tools, the link stops in an approximate position and is immediately "photographed" by a telecamera that detects the actual position of the link.
In case a chain link or piece to be worked takes up an incorrect position, even of only a few millimeter-hundreths, the system calculates with precision both the transversal entity "z" and the longitudinal entity "k" of the off-centre position (along the vice axis) and turns, with the highest precision, the detected measures into an instantaneous forward or backward rotary displacement of the vice so that the link or piece is brought to its proper barycentre position where it can be correctly worked by the incising diamond tools.
Oviously, all the aforesaid phases are instantaneous and almost imperceptible, even if one watches carefully, but the working precision is excellent.
The so-described detecting system allows to perform different operations such as incisions or points by utilizing tools with horizontal and vertical axes as well as all the known working systems with automatic control.
Advantageously, the so-described detecting system can be utilized on diamond machines to work other jewels apart chains, for instance rings, medals, spherical or oval or cylindrical objects, wedding rings and so on, the positioning and working of the piece being automatic.
Another advantage consists in taking advantage of a data bank containing several versions of the sample image. The data bank can be installed in the processing system. In this way, there is not the necessity of detecting piece shape and dimensions each time.
In addition, there is the possibility of controlling the error edges for which the correction processes must intervene by fixing the wished error degrees each time.
A technician of this field can develop and effect changes and variants in the so-described, represented diamond machine, provided with an electronic detecting system according to the present invention, and obtain solutions that are to be considered as included in the scope of protection of the present invention with its specific features as further defined in the following claims.

Claims

Diamond machine (1), equipped with an electronic detecting system to detect the shape of the pieces to be diamond-incised, characterized by the fact that the said detecting system is based on the utilization of at least a telecamera (8) or the like, positioned near the vertical of the piece to be worked, which piece is fed to a vice (4) or the like; images (10) of the piece are obtained and transmitted to a monitor (9) that includes means to set up and process working paramaters, and by the fact that the set up, processed working parameters are then transformed in signals to move the vice that holds the piece so that the vice is able to instantaneously and micrometrically displace each ring or link or piece to be worked and to exactly adjust the barycentre of the piece under the incising diamond tools (3) of the head (2).
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claim, characterized by the presence of a control device including a digital detecting telecamera (8) or the like, placed in the upper part of the head (2) near the vertical of the incising point of the tools, and at least a monitor (9), provided with instruments and software for the control, detection and process of sample images (10) as well as the instantaneous control of the link feeding on the vice (4).
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claims, characterized by the fact that this system is able to produce monitor images (10) representing shape and dimensions of the links to be worked, which images form the base on which operative parameters are set up to define the displacement of vice (4) and tools (3) with a centesimal or even millesimal precision.
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claims, characterized by the fact that the first phase of the detecting system consists in identifying shape and dimensions of the link or sample element to be worked through a "scale tracing" which is effected by displacing the vice (4) in order to bring the link near the centre of the monitor (9), then, the operator traces the main co-ordinates of the piece to be machined by utilizing suitable pointing instruments such as a mouse or the like, these co-ordinates being the co-ordinates "x" and "y" that are calculated in the edges between the light zones "A" and the dark zones "B" of the link to be worked.
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claims, characterized by the fact that the detection of the piece is effected by processing an image through software means so that the system knows the sample image, which usually has a barycentre and edges where the tools (3) work to decorate the piece and the sample image allows to exactly determine the position the clamped link must take up under the tools (3).
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claims, characterized by the fact that in case a chain link or similar piece to be worked takes up an incorrect position, even for only a few millimiter-hundredths, the system calculates exactly both the transversal entity "z" and the longitudinal entity "k" of the off-centre position and turns, with the highest precision, the detected measure into an instantaneous forward and backward rotary displacement of the vice (4) or in a longitudinal or axial displacement so that the link or piece can be brought to its proper barycentre position where it can be correctly worked by the incising diamond tools (3).
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claims, characterized by the fact that the detecting and controlling system can be suitably utilized also on diamond machines to work other jewels apart chain links, such as rings, medals, spherical or oval or cylindrical objects, wedding rings, bracelets and whatever objects to be detected, the positioning and working of the piece being automatic.
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claims, characterized by the fact that there is the possibility of utilizing a data bank containing several versions of the sample image that are installed in the processing system, in this way there being no necessity of detecting piece shape and dimensions each time.
Diamond machine (1), equipped with an electronic detecting system as claimed in the foregoing claims, characterized by the fact that there is the possibility of controlling the error edges for which the correction processes must intervene on fixing and setting up the wished error degrees each time.